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CX02068TQ32 Datenblatt(PDF) 10 Page - M/A-COM Technology Solutions, Inc. |
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CX02068TQ32 Datenblatt(HTML) 10 Page - M/A-COM Technology Solutions, Inc. |
10 / 18 page Functional Description 02068-DSH-001-C Mindspeed Technologies ® 8 Mindspeed Proprietary and Confidential 3.4 Mean Power Control Loop To maintain constant average optical power, the CX02068 incorporates a control loop to compensate for the changes in laser threshold current over temperature and lifetime. A monitor photodiode mounted in the laser package is used to convert the optical power into a photocurrent. The MPC loop adjusts the laser bias current so that the monitor current is matched to a reference current set by a single external resistor (RMPCSET). The time constant of the loop is then determined by CMPC. Safety logic is provided in order to limit the maximum bias current. The bias current at which the safety logic trips is set by an external resistor to ground (ROCA) from the OCASET pin. When the bias current limit is reached alarm flag OCA is asserted LOW. A loop failure alarm is also provided to detect when the bias current can no longer be adjusted to achieve the desired average optical power. Figure 3-3. Typical bias current vs RBIASSET (3.3V) Figure 3-4. Typical limiting current vs ROCA (at 25 °C) 0 20 40 60 80 100 120 0 10000 20000 30000 40000 R BIASSET (Ω ) 0 10 20 30 40 50 60 70 80 90 100 0 10000 20000 30000 40000 R OCA (Ω ) |
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